<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>

        p:first-line{
            color: chocolate;
        }

        /*第一行*/
        p:first-letter{
            color: red;
            font-size: larger;
        }
    </style>
</head>
<body>
<p>
    欲穷千里目,<br>
    更上一层楼
</p>
</body>
</html>